DC Underwater Capillary Discharge With Symmetrical Hole: Diagnostics and Pumping Effect

4th International Workshop & Summer School on Plasma Physics 2010

Halamová, Ivana^1,2 ; Nikiforov, Anton^2 ; Krma, Frantiek^1 ; Leys, Christophe^2

Institute of Physical and Applied Chemistry, Faculty of Chemistry, Brno University of Technology, Purkynova 118, 612 00 Brno, Czech Republic^1

Department of Applied Physics, Ghent University, Jozef Plateaustraat 22, 9000 Ghent, Belgium^2

关键词: Capillary discharges;    Dielectric ceramic;    Electron avalanches;    Electron collision;    Electron velocity;    Negative corona discharges;    Negative streamers;    Positive streamers;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/516/1/012007/pdf
DOI  :  10.1088/1742-6596/516/1/012007

来源: IOP

【 摘 要 】

Capillary discharge investigated by this work was created in the reactor using positive half-cycle of AC high voltage up to 2 kV. Electric field created between two electrodes which were separated by the dielectric ceramic barrier with a symmetrical cylindrical hole (diameter of 1 mm, length of 5 mm) in it. When voltage reached the value sufficient for liquid breakdown, the discharge appeared initially in bubbles of evaporated solution in the hole vicinity and spread further into the liquid volume. After the rise of discharge, two kinds of plasma channels (streamers) propagated towards electrodes from the pin-hole: longer positive streamers on the side with the cathode (analogically as in the positive corona discharge) and shorter negative streamers (like negative corona discharge). These streamer kinds differed especially in the energy dissipation originating from different electron velocities in plasma channels due to electron collisions with positive particles accelerating or decelerating electron avalanches and it gave rise of a significant pump effect.